Porter's Five Forces Analysis

What this tool does

CM8-251 builds a five forces analysis from named indicators rather than from a workshop conversation. Each row is one structural fact — a concentration, a barrier, a contract term — filed under its force, rated 1–5 for the pressure it puts on profitability, tagged with your confidence in it and the direction it is moving, and paired with the response you intend to make. The tool averages the indicators under each force, draws the profile and prints the analysis as a report. It runs inside this single file — no account, no upload, no network request — so a candid view of your market stays on this machine.

What the five forces actually explain

The model answers one question: why are some industries structurally more profitable than others? Not why one company beats another — why average returns differ between making branded medicines and running a restaurant, decade after decade.

Five forces decide how much of the value an industry creates it keeps. Rivalry competes it away in price; new entrants by adding capacity; substitutes cap what buyers will pay at all; powerful buyers take it in discounts and terms; powerful suppliers in input costs. What survives is the industry's profit pool, and its size sets the ceiling for everybody in it.

So the unit of analysis is the industry — a market and a geography — not your company. When you rate a force, the question is "how hard does this make it for anyone here to earn a return?", not "how well do we cope?". A shop with a superb toolroom still sells into a market where seven others can quote the same drawing: the toolroom is how it beats the average, not evidence the average is good.

The most common misuse

The mistake that ruins more five forces analyses than any other is scoring your own company instead of the industry. Rivalry becomes a list of who we beat last quarter; buyer power becomes how good our relationships are; supplier power becomes how long we have used the same merchant. Every force comes back moderate and the analysis concludes — with charts — that everything is fine. The tell is that no result is uncomfortable, and industries are not arranged for your convenience. If rivalry scores low because your quality reputation is strong, you have scored your company; if it scores high because eight shops can quote the same drawing, you have scored the industry — and the reputation belongs in the response column.

A test before accepting a rating: would a competitor across town write the same number? If not, one of you has described a company rather than a market. It also catches the other common error, mistaking an event for a force — a customer paying late is not buyer power; one who is thirty per cent of revenue and buys a commodity is.

The five forces, one at a time

What to look for in a small business, where the signals are operational rather than published.

Competitive rivalry. How many credible alternatives can a buyer reach, and what do they compete on? Count comparable suppliers inside the buyer's practical radius; ask whether the work is specified tightly enough to be tendered on price alone, and whether capacity is tight or slack. Slack capacity plus high fixed costs is the classic recipe for price-led competition.

Threat of new entrants. What stands between a competent outsider and a business that can take your customers? Capital cost is only one barrier: consider approvals and certifications, the time to build a reference list, and access to skilled people. Note direction as well as height — used equipment and rented capacity lower barriers that once looked permanent.

Threat of substitutes. A substitute meets the same need a different way, so it never appears on a competitor list. What matters is the price-performance trade-off and the cost of switching to it. In smaller businesses the worst substitute is the customer doing the work themselves: in-sourcing does not take one order, it removes a category of demand.

Buyer power. Concentration first — what share of revenue sits with the largest one, three and five customers? Then what the contracts say: annual price reductions, extended terms, consignment stock, penalties. A customer for whom you are a rounding error but who is a fifth of your revenue holds the pen, whatever the tone of the relationship.

Supplier power. How many real alternatives exist for each significant input, and what would moving cost? Single-sourcing, standardised tooling, proprietary consumables and specialist subcontractors all create switching costs that hand leverage upstream. Volatile commodity inputs behave like supplier power even where no supplier has market power, because the risk lands on whoever quoted the fixed price.

Scoring from indicators, not opinion

This tool will not let you rate a force directly. You record indicators, and the force score is what they average to. A force rated in one go is an opinion with a number attached: nobody can check it and next year's rating anchors on this year's. An indicator can be argued with. "Top three customers are 58% of revenue" is either true or not; if it falls to 40% the analysis moves on its own, and a colleague who thinks buyer power is overstated must attack a line, not a mood.

Both are plain unweighted averages. The force mean does not weight hard data above impression, and does not know that one indicator matters ten times as much as another — which is why the Force by force table names the top indicator under each. The overall figure appears only once all five forces are scored: a mean of three forces is a third of a verdict. Verdicts run Attractive at 2.0 or below, Mixed to 3.0, Tough to 4.0, Very tough above.

Confidence, and why an extreme rating on an assumption is worse than useless

Every indicator carries a confidence: high for data you could show an auditor, medium for evidence not yet verified, low for an honest assumption. Confidence does not change the arithmetic — a weighted average would hide the problem inside a number — it changes what you do next. The low-confidence count on the tiles is the homework list for the next review.

One combination is refused outright: a rating of 5 or 1 on a low-confidence indicator. An extreme rating is a strong claim about structure; made on an assumption it is worse than no rating, because it moves a force mean, survives into the report and gets quoted in a meeting long after anyone remembers it was a guess. Find the evidence, or move the rating toward neutral until you have. The same logic requires a response on every high-pressure indicator.

Trends matter more than levels

A five forces analysis is a photograph, and photographs date. A moderate force where every indicator is worsening will hurt you sooner than a high force that is easing: the first is a structure moving against you, the second one you have already adapted to. A force at 3.0 with four worsening indicators belongs in this year's plan; a force at 4.5 stable for a decade should shape which business model you run, not which project you start this quarter.

What you can actually do about each force

Structure is not weather. You cannot make an industry attractive, but every force has known responses, recorded here against the indicator that provoked them. The pattern behind all five is the same: reduce the ways you are interchangeable, increase the alternatives you hold.

• Rivalry: differentiate so the comparison stops being price — lead time, service level, technical support — or pick a segment the crowd cannot serve.
• New entrants: raise what it costs to reach your standard through certifications and tooling, and hold relationships a newcomer must break to get in.
• Substitutes: compete where the substitute is weak; where it genuinely wins, withdraw deliberately and redeploy the capacity rather than defending with price.
• Buyer power: diversify the customer base — the most reliable move a small business has — and raise switching costs with design involvement or tooling ownership.
• Supplier power: qualify a second source before you need one, standardise on what is widely available, hold contract stock on volatile inputs, or integrate backwards.

Where this sits next to other tools

Five forces is industry structure — the economics of the market you sell into. A PESTLE covers the wider environment beyond the industry: political, economic, social, technological, legal and environmental change acting on everybody. A SWOT is about you — capabilities and gaps against what those two uncover. In that order a SWOT nearly writes itself; in reverse it becomes a list of feelings about last quarter.

Saving and printing

Indicators, settings and the report header are written to this browser's local storage as you type. That storage belongs to one browser on one computer, so treat Export .json as the real save — one file holding everything, which Import .json restores anywhere. Reset asks twice, then erases everything, with no undo. Print Report produces the pack from whatever the filter shows, and the scope line states any filter in force — clear it before issuing anything described as the complete analysis.

FAQ

What if one force has only one indicator? Its mean is really one opinion. The Settings tab lets you raise the minimum so an under-evidenced force shows a dash instead of a score, and is not counted toward the overall verdict.

Can one fact sit under two forces? Usually it means the fact is written too loosely. "Customers are consolidating their supply base" is buyer power; "customers are installing their own machines" is a substitute. Split it and rate each where it belongs.

Should a strength of ours lower a force score? No — record it as the response, not the rating. If your quality record protects you from price-led rivalry, rivalry is still high in that industry; you are simply exposed to less of it than the average.

Accuracy & disclaimer

This tool structures an analysis; it does not validate one. The force means and the overall figure are averages of the ratings you entered, and the tool has no knowledge of your market, competitors or accounts against which to check them. An analysis built on assumptions produces the same charts as one built on ledgers and signed contracts.

The model describes structure at a point in time; it does not predict. Use the output as an agenda for decisions made by people who know the business. It is an analysis aid, not advice of any kind.